linux-kernel - Re: [PATCH] modules: add modalias file to sysfs for modules.

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Date:   Mon, 14 Nov 2022 10:42:50 -0600
From:   Allen Webb <allenwebb@...gle.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     Lucas De Marchi <lucas.demarchi@...el.com>,
        Alexey Gladkov <gladkov.alexey@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] modules: add modalias file to sysfs for modules.

On Fri, Nov 11, 2022 at 12:29 PM Luis Chamberlain <mcgrof@...nel.org> wrote:
>
> On Fri, Nov 11, 2022 at 09:28:52AM -0600, Allen Webb wrote:
> > USB devices support the authorized attribute which can be used by
> > user-space to implement trust-based systems for enabling USB devices. It
> > would be helpful when building these systems to be able to know in
> > advance which kernel drivers (or modules) are reachable from a
> > particular USB device.
> >
> > This information is readily available for external modules in
> > modules.alias. However, builtin kernel modules are not covered. This
> > patch adds a sys-fs attribute to both builtin and loaded modules
> > exposing the matching rules in the modalias format for integration
> > with tools like USBGuard.
> >
> > Signed-off-by: Allen Webb <allenwebb@...gle.com>
>
> Thanks for the patch Allen!
>
> I'd rather have something generic though, and it would seem kmod [0] already
> does this, have you seen the kmod support for builtin.alias.bin
>
> Can't that be used?

Probably, but I don't see the builtin.alias.bin in my build. Is it experimental?

>
> [0] git://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git
>
>   Luis